Probing invisible neutrino decay with the first six detection units of KM3NeT/ORCA

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21670%2F25%3A00384169" target="_blank" >RIV/68407700:21670/25:00384169 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1007/JHEP04(2025)105" target="_blank" >https://doi.org/10.1007/JHEP04(2025)105</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP04(2025)105" target="_blank" >10.1007/JHEP04(2025)105</a>

Result language
angličtina
Original language name
Probing invisible neutrino decay with the first six detection units of KM3NeT/ORCA
Original language description
In the era of precision measurements of neutrino oscillation parameters, it is necessary for experiments to disentangle discrepancies that may indicate physics beyond the Standard Model in the neutrino sector. KM3NeT/ORCA is a water Cherenkov neutrino detector under construction and anchored at the bottom of the Mediterranean Sea. The detector is designed to study the oscillations of atmospheric neutrinos and determine the neutrino mass ordering. This paper focuses on the initial configuration of ORCA, referred to as ORCA6, which comprises six out of the foreseen 115 detection units of photosensors. A high-purity neutrino sample was extracted during 2020 and 2021, corresponding to an exposure of 433 kton-years. This sample is analysed following a binned log-likelihood approach to search for invisible neutrino decay, in a three-flavour neutrino oscillation scenario, where the third neutrino mass state ν3 decays into an invisible state, e.g. a sterile neutrino. The resulting best fit of the invisible neutrino decay parameter is α3=0.92-0.57+1.08x10-4 eV2, corresponding to a scenario with θ23 in the second octant and normal neutrino mass ordering. The results are consistent with the Standard Model, within a 2.1 σ interval.
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
<a href="/en/project/GA24-12702S" target="_blank" >GA24-12702S: Experimental and theoretical studies of astrophysical high-energy neutrinos in KM3NeT neutrino telescopes</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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